Trigonometric Functions And Equations

\((\cos {\alpha _1})(\cos {\alpha _2}).....(\cot {\alpha _n}) = 1,0 < {\alpha _1},{\alpha _2},....{\alpha _n} < \pi /2\) হলে \((\cos {\alpha _1})(\cos {\alpha _2}).....(\cos {\alpha _n})\) এর সর্বোচ্চ মান হবে